/*
 * Wi-Fi Protected Setup - Registrar
 * Copyright (c) 2008-2009, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "utils/includes.h"

#include "utils/common.h"
#include "utils/base64.h"
#include "utils/eloop.h"
#include "utils/uuid.h"
#include "utils/list.h"
#include "crypto/crypto.h"
#include "crypto/sha256.h"
#include "common/ieee802_11_defs.h"
#include "wps_i.h"
#include "wps_dev_attr.h"
#include "../misc.h"

#define WPS_WORKAROUNDS

struct wps_uuid_pin {
    struct dl_list list;
    u8 uuid[WPS_UUID_LEN];
    int wildcard_uuid;
    u8 *pin;
    size_t pin_len;
#define PIN_LOCKED BIT(0)
#define PIN_EXPIRES BIT(1)
    int flags;
    struct os_time expiration;
};


static void wps_free_pin(struct wps_uuid_pin *pin)
{
    os_free(pin->pin);
    os_free(pin);
}


static void wps_remove_pin(struct wps_uuid_pin *pin)
{
    dl_list_del(&pin->list);
    wps_free_pin(pin);
}


static void wps_free_pins(struct dl_list *pins)
{
    struct wps_uuid_pin *pin, *prev;
    dl_list_for_each_safe(pin, prev, pins, struct wps_uuid_pin, list)
        wps_remove_pin(pin);
}


struct wps_pbc_session {
    struct wps_pbc_session *next;
    u8 addr[ETH_ALEN];
    u8 uuid_e[WPS_UUID_LEN];
    struct os_time timestamp;
};


static void wps_free_pbc_sessions(struct wps_pbc_session *pbc)
{
    struct wps_pbc_session *prev;

    while (pbc) {
        prev = pbc;
        pbc = pbc->next;
        os_free(prev);
    }
}


struct wps_registrar_device {
    struct wps_registrar_device *next;
    struct wps_device_data dev;
    u8 uuid[WPS_UUID_LEN];
};


struct wps_registrar {
    struct wps_context *wps;

    int pbc;
    int selected_registrar;

    int (*new_psk_cb)(void *ctx, const u8 *mac_addr, const u8 *psk,
            size_t psk_len);
    int (*set_ie_cb)(void *ctx, struct wpabuf *beacon_ie,
            struct wpabuf *probe_resp_ie);
    void (*pin_needed_cb)(void *ctx, const u8 *uuid_e,
            const struct wps_device_data *dev);
    void (*reg_success_cb)(void *ctx, const u8 *mac_addr,
            const u8 *uuid_e);
    void (*set_sel_reg_cb)(void *ctx, int sel_reg, u16 dev_passwd_id,
            u16 sel_reg_config_methods);
    void (*enrollee_seen_cb)(void *ctx, const u8 *addr, const u8 *uuid_e,
            const u8 *pri_dev_type, u16 config_methods,
            u16 dev_password_id, u8 request_type,
            const char *dev_name);
    void *cb_ctx;

    struct dl_list pins;
    struct wps_pbc_session *pbc_sessions;

    int skip_cred_build;
    struct wpabuf *extra_cred;
    int disable_auto_conf;
    int sel_reg_union;
    int sel_reg_dev_password_id_override;
    int sel_reg_config_methods_override;
    int static_wep_only;

    struct wps_registrar_device *devices;

    int force_pbc_overlap;
};


static int wps_set_ie(struct wps_registrar *reg);
static void wps_registrar_pbc_timeout(void *eloop_ctx, void *timeout_ctx);
static void wps_registrar_set_selected_timeout(void *eloop_ctx,
        void *timeout_ctx);


static void wps_free_devices(struct wps_registrar_device *dev)
{
    struct wps_registrar_device *prev;

    while (dev) {
        prev = dev;
        dev = dev->next;
        wps_device_data_free(&prev->dev);
        os_free(prev);
    }
}


static struct wps_registrar_device * wps_device_get(struct wps_registrar *reg,
        const u8 *addr)
{
    struct wps_registrar_device *dev;

    for (dev = reg->devices; dev; dev = dev->next) {
        if (os_memcmp(dev->dev.mac_addr, addr, ETH_ALEN) == 0)
            return dev;
    }
    return NULL;
}


static void wps_device_clone_data(struct wps_device_data *dst,
        struct wps_device_data *src)
{
    os_memcpy(dst->mac_addr, src->mac_addr, ETH_ALEN);
    os_memcpy(dst->pri_dev_type, src->pri_dev_type, WPS_DEV_TYPE_LEN);

#define WPS_STRDUP(n) \
    os_free(dst->n); \
    dst->n = src->n ? os_strdup(src->n) : NULL

    WPS_STRDUP(device_name);
    WPS_STRDUP(manufacturer);
    WPS_STRDUP(model_name);
    WPS_STRDUP(model_number);
    WPS_STRDUP(serial_number);
#undef WPS_STRDUP
}


int wps_device_store(struct wps_registrar *reg,
        struct wps_device_data *dev, const u8 *uuid)
{
    struct wps_registrar_device *d;

    d = wps_device_get(reg, dev->mac_addr);
    if (d == NULL) {
        d = os_zalloc(sizeof(*d));
        if (d == NULL)
            return -1;
        d->next = reg->devices;
        reg->devices = d;
    }

    wps_device_clone_data(&d->dev, dev);
    os_memcpy(d->uuid, uuid, WPS_UUID_LEN);

    return 0;
}


static void wps_registrar_add_pbc_session(struct wps_registrar *reg,
        const u8 *addr, const u8 *uuid_e)
{
    struct wps_pbc_session *pbc, *prev = NULL;
    struct os_time now;

    os_get_time(&now);

    pbc = reg->pbc_sessions;
    while (pbc) {
        if (os_memcmp(pbc->addr, addr, ETH_ALEN) == 0 &&
                os_memcmp(pbc->uuid_e, uuid_e, WPS_UUID_LEN) == 0) {
            if (prev)
                prev->next = pbc->next;
            else
                reg->pbc_sessions = pbc->next;
            break;
        }
        prev = pbc;
        pbc = pbc->next;
    }

    if (!pbc) {
        pbc = os_zalloc(sizeof(*pbc));
        if (pbc == NULL)
            return;
        os_memcpy(pbc->addr, addr, ETH_ALEN);
        if (uuid_e)
            os_memcpy(pbc->uuid_e, uuid_e, WPS_UUID_LEN);
    }

    pbc->next = reg->pbc_sessions;
    reg->pbc_sessions = pbc;
    pbc->timestamp = now;

    /* remove entries that have timed out */
    prev = pbc;
    pbc = pbc->next;

    while (pbc) {
        if (now.sec > pbc->timestamp.sec + WPS_PBC_WALK_TIME) {
            prev->next = NULL;
            wps_free_pbc_sessions(pbc);
            break;
        }
        prev = pbc;
        pbc = pbc->next;
    }
}


static void wps_registrar_remove_pbc_session(struct wps_registrar *reg,
        const u8 *addr, const u8 *uuid_e)
{
    struct wps_pbc_session *pbc, *prev = NULL;

    pbc = reg->pbc_sessions;
    while (pbc) {
        if (os_memcmp(pbc->addr, addr, ETH_ALEN) == 0 &&
                os_memcmp(pbc->uuid_e, uuid_e, WPS_UUID_LEN) == 0) {
            if (prev)
                prev->next = pbc->next;
            else
                reg->pbc_sessions = pbc->next;
            os_free(pbc);
            break;
        }
        prev = pbc;
        pbc = pbc->next;
    }
}


static int wps_registrar_pbc_overlap(struct wps_registrar *reg,
        const u8 *addr, const u8 *uuid_e)
{
    int count = 0;
    struct wps_pbc_session *pbc;
    struct os_time now;

    os_get_time(&now);

    for (pbc = reg->pbc_sessions; pbc; pbc = pbc->next) {
        if (now.sec > pbc->timestamp.sec + WPS_PBC_WALK_TIME)
            break;
        if (addr == NULL || os_memcmp(addr, pbc->addr, ETH_ALEN) ||
                uuid_e == NULL ||
                os_memcmp(uuid_e, pbc->uuid_e, WPS_UUID_LEN))
            count++;
    }

    if (addr || uuid_e)
        count++;

    return count > 1 ? 1 : 0;
}


static int wps_build_wps_state(struct wps_context *wps, struct wpabuf *msg)
{
    wpa_printf(MSG_DEBUG, "WPS:  * Wi-Fi Protected Setup State (%d)",
            wps->wps_state);
    wpabuf_put_be16(msg, ATTR_WPS_STATE);
    wpabuf_put_be16(msg, 1);
    wpabuf_put_u8(msg, wps->wps_state);
    return 0;
}


#ifdef CONFIG_WPS_UPNP
static void wps_registrar_free_pending_m2(struct wps_context *wps)
{
    struct upnp_pending_message *p, *p2, *prev = NULL;
    p = wps->upnp_msgs;
    while (p) {
        if (p->type == WPS_M2 || p->type == WPS_M2D) {
            if (prev == NULL)
                wps->upnp_msgs = p->next;
            else
                prev->next = p->next;
            wpa_printf(MSG_DEBUG, "WPS UPnP: Drop pending M2/M2D");
            p2 = p;
            p = p->next;
            wpabuf_free(p2->msg);
            os_free(p2);
            continue;
        }
        prev = p;
        p = p->next;
    }
}
#endif /* CONFIG_WPS_UPNP */


static int wps_build_ap_setup_locked(struct wps_context *wps,
        struct wpabuf *msg)
{
    if (wps->ap_setup_locked) {
        wpa_printf(MSG_DEBUG, "WPS:  * AP Setup Locked");
        wpabuf_put_be16(msg, ATTR_AP_SETUP_LOCKED);
        wpabuf_put_be16(msg, 1);
        wpabuf_put_u8(msg, 1);
    }
    return 0;
}


static int wps_build_selected_registrar(struct wps_registrar *reg,
        struct wpabuf *msg)
{
    if (!reg->sel_reg_union)
        return 0;
    wpa_printf(MSG_DEBUG, "WPS:  * Selected Registrar");
    wpabuf_put_be16(msg, ATTR_SELECTED_REGISTRAR);
    wpabuf_put_be16(msg, 1);
    wpabuf_put_u8(msg, 1);
    return 0;
}


static int wps_build_sel_reg_dev_password_id(struct wps_registrar *reg,
        struct wpabuf *msg)
{
    u16 id = reg->pbc ? DEV_PW_PUSHBUTTON : DEV_PW_DEFAULT;
    if (!reg->sel_reg_union)
        return 0;
    if (reg->sel_reg_dev_password_id_override >= 0)
        id = reg->sel_reg_dev_password_id_override;
    wpa_printf(MSG_DEBUG, "WPS:  * Device Password ID (%d)", id);
    wpabuf_put_be16(msg, ATTR_DEV_PASSWORD_ID);
    wpabuf_put_be16(msg, 2);
    wpabuf_put_be16(msg, id);
    return 0;
}


static int wps_build_sel_reg_config_methods(struct wps_registrar *reg,
        struct wpabuf *msg)
{
    u16 methods;
    if (!reg->sel_reg_union)
        return 0;
    methods = reg->wps->config_methods & ~WPS_CONFIG_PUSHBUTTON;
    if (reg->pbc)
        methods |= WPS_CONFIG_PUSHBUTTON;
    if (reg->sel_reg_config_methods_override >= 0)
        methods = reg->sel_reg_config_methods_override;
    wpa_printf(MSG_DEBUG, "WPS:  * Selected Registrar Config Methods (%x)",
            methods);
    wpabuf_put_be16(msg, ATTR_SELECTED_REGISTRAR_CONFIG_METHODS);
    wpabuf_put_be16(msg, 2);
    wpabuf_put_be16(msg, methods);
    return 0;
}


static int wps_build_probe_config_methods(struct wps_registrar *reg,
        struct wpabuf *msg)
{
    u16 methods;
    /*
     * These are the methods that the AP supports as an Enrollee for adding
     * external Registrars.
     */
    methods = reg->wps->config_methods & ~WPS_CONFIG_PUSHBUTTON;
    wpa_printf(MSG_DEBUG, "WPS:  * Config Methods (%x)", methods);
    wpabuf_put_be16(msg, ATTR_CONFIG_METHODS);
    wpabuf_put_be16(msg, 2);
    wpabuf_put_be16(msg, methods);
    return 0;
}


static int wps_build_config_methods_r(struct wps_registrar *reg,
        struct wpabuf *msg)
{
    u16 methods;
    if(reg == NULL)
    {
        return 0;
    }

    methods = WPS_CONFIG_LABEL | WPS_CONFIG_DISPLAY | WPS_CONFIG_PUSHBUTTON;
    /*
       methods = reg->wps->config_methods & ~WPS_CONFIG_PUSHBUTTON;
       if (reg->pbc)
       methods |= WPS_CONFIG_PUSHBUTTON;
       */
    return wps_build_config_methods(msg, methods);
}


/**
 * wps_registrar_init - Initialize WPS Registrar data
 * @wps: Pointer to longterm WPS context
 * @cfg: Registrar configuration
 * Returns: Pointer to allocated Registrar data or %NULL on failure
 *
 * This function is used to initialize WPS Registrar functionality. It can be
 * used for a single Registrar run (e.g., when run in a supplicant) or multiple
 * runs (e.g., when run as an internal Registrar in an AP). Caller is
 * responsible for freeing the returned data with wps_registrar_deinit() when
 * Registrar functionality is not needed anymore.
 */
    struct wps_registrar *
wps_registrar_init(struct wps_context *wps,
        const struct wps_registrar_config *cfg)
{
    struct wps_registrar *reg = os_zalloc(sizeof(*reg));
    if (reg == NULL)
        return NULL;

    dl_list_init(&reg->pins);
    reg->wps = wps;
    reg->new_psk_cb = cfg->new_psk_cb;
    reg->set_ie_cb = cfg->set_ie_cb;
    reg->pin_needed_cb = cfg->pin_needed_cb;
    reg->reg_success_cb = cfg->reg_success_cb;
    reg->set_sel_reg_cb = cfg->set_sel_reg_cb;
    reg->enrollee_seen_cb = cfg->enrollee_seen_cb;
    reg->cb_ctx = cfg->cb_ctx;
    reg->skip_cred_build = cfg->skip_cred_build;
    if (cfg->extra_cred) {
        reg->extra_cred = wpabuf_alloc_copy(cfg->extra_cred,
                cfg->extra_cred_len);
        if (reg->extra_cred == NULL) {
            os_free(reg);
            return NULL;
        }
    }
    reg->disable_auto_conf = cfg->disable_auto_conf;
    reg->sel_reg_dev_password_id_override = -1;
    reg->sel_reg_config_methods_override = -1;
    reg->static_wep_only = cfg->static_wep_only;

    if (wps_set_ie(reg)) {
        wps_registrar_deinit(reg);
        return NULL;
    }

    return reg;
}


/**
 * wps_registrar_deinit - Deinitialize WPS Registrar data
 * @reg: Registrar data from wps_registrar_init()
 */
void wps_registrar_deinit(struct wps_registrar *reg)
{
    if (reg == NULL)
        return;
    eloop_cancel_timeout(wps_registrar_pbc_timeout, reg, NULL);
    eloop_cancel_timeout(wps_registrar_set_selected_timeout, reg, NULL);
    wps_free_pins(&reg->pins);
    wps_free_pbc_sessions(reg->pbc_sessions);
    wpabuf_free(reg->extra_cred);
    wps_free_devices(reg->devices);
    os_free(reg);
}


/**
 * wps_registrar_add_pin - Configure a new PIN for Registrar
 * @reg: Registrar data from wps_registrar_init()
 * @uuid: UUID-E or %NULL for wildcard (any UUID)
 * @pin: PIN (Device Password)
 * @pin_len: Length of pin in octets
 * @timeout: Time (in seconds) when the PIN will be invalidated; 0 = no timeout
 * Returns: 0 on success, -1 on failure
 */
int wps_registrar_add_pin(struct wps_registrar *reg, const u8 *uuid,
        const u8 *pin, size_t pin_len, int timeout)
{
    struct wps_uuid_pin *p;

    if(reg == NULL)
        return -1;

    p = os_zalloc(sizeof(*p));
    if (p == NULL)
        return -1;
    if (uuid == NULL)
        p->wildcard_uuid = 1;
    else
        os_memcpy(p->uuid, uuid, WPS_UUID_LEN);
    p->pin = os_malloc(pin_len);
    if (p->pin == NULL) {
        os_free(p);
        return -1;
    }
    os_memcpy(p->pin, pin, pin_len);
    p->pin_len = pin_len;

    if (timeout) {
        p->flags |= PIN_EXPIRES;
        os_get_time(&p->expiration);
        p->expiration.sec += timeout;
    }

    dl_list_add(&reg->pins, &p->list);

    wpa_printf(MSG_DEBUG, "WPS: A new PIN configured (timeout=%d)",
            timeout);
    wpa_hexdump(MSG_DEBUG, "WPS: UUID", uuid, WPS_UUID_LEN);
    wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: PIN", pin, pin_len);
    reg->selected_registrar = 1;
    reg->pbc = 0;
    wps_registrar_selected_registrar_changed(reg);
    /* @@@ HACK: We don't use these registrar timeouts, so calling these eloop
     * functions causes a seg fault.
     */
    /*eloop_cancel_timeout(wps_registrar_set_selected_timeout, reg, NULL);
      eloop_register_timeout(WPS_PBC_WALK_TIME, 0,
      wps_registrar_set_selected_timeout,
      reg, NULL);
      */
    return 0;
}


static void wps_registrar_expire_pins(struct wps_registrar *reg)
{
    struct wps_uuid_pin *pin, *prev;
    struct os_time now;

    if(reg != NULL)
    {
        os_get_time(&now);
        dl_list_for_each_safe(pin, prev, &reg->pins, struct wps_uuid_pin, list)
        {
            if(pin != NULL)
            {
                if ((pin->flags & PIN_EXPIRES) &&
                        os_time_before(&pin->expiration, &now)) {
                    wpa_hexdump(MSG_DEBUG, "WPS: Expired PIN for UUID",
                            pin->uuid, WPS_UUID_LEN);
                    wps_remove_pin(pin);
                }
            }
        }
    }
}


/**
 * wps_registrar_invalidate_pin - Invalidate a PIN for a specific UUID-E
 * @reg: Registrar data from wps_registrar_init()
 * @uuid: UUID-E
 * Returns: 0 on success, -1 on failure (e.g., PIN not found)
 */
int wps_registrar_invalidate_pin(struct wps_registrar *reg, const u8 *uuid)
{
    struct wps_uuid_pin *pin, *prev;

    if(reg == NULL)
        return -1;

    dl_list_for_each_safe(pin, prev, &reg->pins, struct wps_uuid_pin, list)
    {
        if (os_memcmp(pin->uuid, uuid, WPS_UUID_LEN) == 0) {
            wpa_hexdump(MSG_DEBUG, "WPS: Invalidated PIN for UUID",
                    pin->uuid, WPS_UUID_LEN);
            wps_remove_pin(pin);
            return 0;
        }
    }

    return -1;
}


static const u8 * wps_registrar_get_pin(struct wps_registrar *reg,
        const u8 *uuid, size_t *pin_len)
{
    struct wps_uuid_pin *pin, *found = NULL;

    if(reg == NULL)
        return NULL;

    wps_registrar_expire_pins(reg);

    dl_list_for_each(pin, &reg->pins, struct wps_uuid_pin, list) {
        if (!pin->wildcard_uuid &&
                os_memcmp(pin->uuid, uuid, WPS_UUID_LEN) == 0) {
            found = pin;
            break;
        }
    }

    if (!found) {
        /* Check for wildcard UUIDs since none of the UUID-specific
         * PINs matched */
        dl_list_for_each(pin, &reg->pins, struct wps_uuid_pin, list) {
            if (pin->wildcard_uuid == 1) {
                wpa_printf(MSG_DEBUG, "WPS: Found a wildcard "
                        "PIN. Assigned it for this UUID-E");
                pin->wildcard_uuid = 2;
                os_memcpy(pin->uuid, uuid, WPS_UUID_LEN);
                found = pin;
                break;
            }
        }
    }

    if (!found)
        return NULL;

    /*
     * Lock the PIN to avoid attacks based on concurrent re-use of the PIN
     * that could otherwise avoid PIN invalidations.
     */
    if (found->flags & PIN_LOCKED) {
        wpa_printf(MSG_DEBUG, "WPS: Selected PIN locked - do not "
                "allow concurrent re-use");
        return NULL;
    }
    *pin_len = found->pin_len;
    found->flags |= PIN_LOCKED;
    return found->pin;
}


/**
 * wps_registrar_unlock_pin - Unlock a PIN for a specific UUID-E
 * @reg: Registrar data from wps_registrar_init()
 * @uuid: UUID-E
 * Returns: 0 on success, -1 on failure
 *
 * PINs are locked to enforce only one concurrent use. This function unlocks a
 * PIN to allow it to be used again. If the specified PIN was configured using
 * a wildcard UUID, it will be removed instead of allowing multiple uses.
 */
int wps_registrar_unlock_pin(struct wps_registrar *reg, const u8 *uuid)
{
    struct wps_uuid_pin *pin;

    if(reg != NULL)
    {
        dl_list_for_each(pin, &reg->pins, struct wps_uuid_pin, list) {
            if (os_memcmp(pin->uuid, uuid, WPS_UUID_LEN) == 0) {
                if (pin->wildcard_uuid == 2) {
                    wpa_printf(MSG_DEBUG, "WPS: Invalidating used "
                            "wildcard PIN");
                    return wps_registrar_invalidate_pin(reg, uuid);
                }
                pin->flags &= ~PIN_LOCKED;
                return 0;
            }
        }
    }

    return -1;
}


static void wps_registrar_stop_pbc(struct wps_registrar *reg)
{
    if(reg != NULL)
    {
        reg->selected_registrar = 0;
        reg->pbc = 0;
        wps_registrar_selected_registrar_changed(reg);
    }
}


static void wps_registrar_pbc_timeout(void *eloop_ctx, void *timeout_ctx)
{
    struct wps_registrar *reg = eloop_ctx;

    if(reg != NULL)
    {
        wpa_printf(MSG_DEBUG, "WPS: PBC timed out - disable PBC mode");
        wps_pbc_timeout_event(reg->wps);
        wps_registrar_stop_pbc(reg);
    }
}


/**
 * wps_registrar_button_pushed - Notify Registrar that AP button was pushed
 * @reg: Registrar data from wps_registrar_init()
 * Returns: 0 on success, -1 on failure
 *
 * This function is called on an AP when a push button is pushed to activate
 * PBC mode. The PBC mode will be stopped after walk time (2 minutes) timeout
 * or when a PBC registration is completed.
 */
int wps_registrar_button_pushed(struct wps_registrar *reg)
{
    if(reg == NULL)
        return -1;

    if (wps_registrar_pbc_overlap(reg, NULL, NULL)) {
        wpa_printf(MSG_DEBUG, "WPS: PBC overlap - do not start PBC "
                "mode");
        wps_pbc_overlap_event(reg->wps);
        return -1;
    }
    wpa_printf(MSG_DEBUG, "WPS: Button pushed - PBC mode started");
    reg->force_pbc_overlap = 0;
    reg->selected_registrar = 1;
    reg->pbc = 1;
    wps_registrar_selected_registrar_changed(reg);

    eloop_cancel_timeout(wps_registrar_pbc_timeout, reg, NULL);
    eloop_register_timeout(WPS_PBC_WALK_TIME, 0, wps_registrar_pbc_timeout,
            reg, NULL);
    return 0;
}


static void wps_registrar_pbc_completed(struct wps_registrar *reg)
{
    if(reg != NULL)
    {
        wpa_printf(MSG_DEBUG, "WPS: PBC completed - stopping PBC mode");
        eloop_cancel_timeout(wps_registrar_pbc_timeout, reg, NULL);
        wps_registrar_stop_pbc(reg);
    }
}


static void wps_registrar_pin_completed(struct wps_registrar *reg)
{
    if(reg != NULL)
    {
        wpa_printf(MSG_DEBUG, "WPS: PIN completed using internal Registrar");
        eloop_cancel_timeout(wps_registrar_set_selected_timeout, reg, NULL);
        reg->selected_registrar = 0;
        wps_registrar_selected_registrar_changed(reg);
    }
}


/**
 * wps_registrar_probe_req_rx - Notify Registrar of Probe Request
 * @reg: Registrar data from wps_registrar_init()
 * @addr: MAC address of the Probe Request sender
 * @wps_data: WPS IE contents
 *
 * This function is called on an AP when a Probe Request with WPS IE is
 * received. This is used to track PBC mode use and to detect possible overlap
 * situation with other WPS APs.
 */
void wps_registrar_probe_req_rx(struct wps_registrar *reg, const u8 *addr,
        const struct wpabuf *wps_data)
{
    struct wps_parse_attr attr;

    if(reg == NULL)
        return;

    wpa_hexdump_buf(MSG_MSGDUMP,
            "WPS: Probe Request with WPS data received",
            wps_data);

    if (wps_parse_msg(wps_data, &attr) < 0)
        return;
    if (!wps_version_supported(attr.version)) {
        wpa_printf(MSG_DEBUG, "WPS: Unsupported ProbeReq WPS IE "
                "version 0x%x", attr.version ? *attr.version : 0);
        return;
    }

    if (attr.config_methods == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No Config Methods attribute in "
                "Probe Request");
        return;
    }

    if (attr.dev_password_id == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No Device Password Id attribute "
                "in Probe Request");
        return;
    }

    if (reg->enrollee_seen_cb && attr.uuid_e &&
            attr.primary_dev_type && attr.request_type) {
        char *dev_name = NULL;
        if (attr.dev_name) {
            dev_name = os_zalloc(attr.dev_name_len + 1);
            if (dev_name) {
                os_memcpy(dev_name, attr.dev_name,
                        attr.dev_name_len);
            }
        }
        reg->enrollee_seen_cb(reg->cb_ctx, addr, attr.uuid_e,
                attr.primary_dev_type,
                WPA_GET_BE16(attr.config_methods),
                WPA_GET_BE16(attr.dev_password_id),
                *attr.request_type, dev_name);
        os_free(dev_name);
    }

    if (WPA_GET_BE16(attr.dev_password_id) != DEV_PW_PUSHBUTTON)
        return; /* Not PBC */

    wpa_printf(MSG_DEBUG, "WPS: Probe Request for PBC received from "
            MACSTR, MAC2STR(addr));
    if (attr.uuid_e == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: Invalid Probe Request WPS IE: No "
                "UUID-E included");
        return;
    }

    wps_registrar_add_pbc_session(reg, addr, attr.uuid_e);
    if (wps_registrar_pbc_overlap(reg, addr, attr.uuid_e)) {
        wpa_printf(MSG_DEBUG, "WPS: PBC session overlap detected");
        reg->force_pbc_overlap = 1;
        wps_pbc_overlap_event(reg->wps);
    }
}


static int wps_cb_new_psk(struct wps_registrar *reg, const u8 *mac_addr,
        const u8 *psk, size_t psk_len)
{
    if(reg == NULL)
        return 0;

    if (reg->new_psk_cb == NULL)
        return 0;

    return reg->new_psk_cb(reg->cb_ctx, mac_addr, psk, psk_len);
}


static void wps_cb_pin_needed(struct wps_registrar *reg, const u8 *uuid_e,
        const struct wps_device_data *dev)
{
    if(reg == NULL)
        return;

    if (reg->pin_needed_cb == NULL)
        return;

    reg->pin_needed_cb(reg->cb_ctx, uuid_e, dev);
}


static void wps_cb_reg_success(struct wps_registrar *reg, const u8 *mac_addr,
        const u8 *uuid_e)
{
    if(reg == NULL)
        return;

    if (reg->reg_success_cb == NULL)
        return;

    reg->reg_success_cb(reg->cb_ctx, mac_addr, uuid_e);
}


static int wps_cb_set_ie(struct wps_registrar *reg, struct wpabuf *beacon_ie,
        struct wpabuf *probe_resp_ie)
{
    if(reg == NULL)
        return 0;

    return reg->set_ie_cb(reg->cb_ctx, beacon_ie, probe_resp_ie);
}


static void wps_cb_set_sel_reg(struct wps_registrar *reg)
{
    if(reg == NULL)
        return;

    wpa_printf(MSG_DEBUG, "WPS: Enter wps_cg_set_sel_reg");
    u16 methods = 0;
    if (reg->set_sel_reg_cb == NULL)
    {
        wpa_printf(MSG_DEBUG, "WPS: Leave wps_cg_set_sel_reg early");
        return;
    }

    wpa_printf(MSG_DEBUG, "WPS: reg->selected_registrar");
    if (reg->selected_registrar) {
        methods = reg->wps->config_methods & ~WPS_CONFIG_PUSHBUTTON;
        if (reg->pbc)
            methods |= WPS_CONFIG_PUSHBUTTON;
    }

    wpa_printf(MSG_DEBUG, "WPS: reg->set_sel_reg_cb");
    reg->set_sel_reg_cb(reg->cb_ctx, reg->selected_registrar,
            reg->pbc ? DEV_PW_PUSHBUTTON : DEV_PW_DEFAULT,
            methods);

    wpa_printf(MSG_DEBUG, "WPS: Leave wps_cg_set_sel_reg");
}


/* Encapsulate WPS IE data with one (or more, if needed) IE headers */
static struct wpabuf * wps_ie_encapsulate(struct wpabuf *data)
{
    struct wpabuf *ie;
    const u8 *pos, *end;

    ie = wpabuf_alloc(wpabuf_len(data) + 100);
    if (ie == NULL) {
        wpabuf_free(data);
        return NULL;
    }

    pos = wpabuf_head(data);
    end = pos + wpabuf_len(data);

    while (end > pos) {
        size_t frag_len = end - pos;
        if (frag_len > 251)
            frag_len = 251;
        wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
        wpabuf_put_u8(ie, 4 + frag_len);
        wpabuf_put_be32(ie, WPS_DEV_OUI_WFA);
        wpabuf_put_data(ie, pos, frag_len);
        pos += frag_len;
    }

    wpabuf_free(data);

    return ie;
}


static int wps_set_ie(struct wps_registrar *reg)
{
    struct wpabuf *beacon;
    struct wpabuf *probe;

    if (reg->set_ie_cb == NULL)
        return 0;

    wpa_printf(MSG_DEBUG, "WPS: Build Beacon and Probe Response IEs");

    beacon = wpabuf_alloc(300);
    if (beacon == NULL)
        return -1;
    probe = wpabuf_alloc(400);
    if (probe == NULL) {
        wpabuf_free(beacon);
        return -1;
    }

    if (wps_build_version(beacon) ||
            wps_build_wps_state(reg->wps, beacon) ||
            wps_build_ap_setup_locked(reg->wps, beacon) ||
            wps_build_selected_registrar(reg, beacon) ||
            wps_build_sel_reg_dev_password_id(reg, beacon) ||
            wps_build_sel_reg_config_methods(reg, beacon) ||
            wps_build_version(probe) ||
            wps_build_wps_state(reg->wps, probe) ||
            wps_build_ap_setup_locked(reg->wps, probe) ||
            wps_build_selected_registrar(reg, probe) ||
            wps_build_sel_reg_dev_password_id(reg, probe) ||
            wps_build_sel_reg_config_methods(reg, probe) ||
            wps_build_resp_type(probe, reg->wps->ap ? WPS_RESP_AP :
                WPS_RESP_REGISTRAR) ||
            wps_build_uuid_e(probe, reg->wps->uuid) ||
            wps_build_device_attrs(&reg->wps->dev, probe) ||
            wps_build_probe_config_methods(reg, probe) ||
            wps_build_rf_bands(&reg->wps->dev, probe)) {
        wpabuf_free(beacon);
        wpabuf_free(probe);
        return -1;
    }

    beacon = wps_ie_encapsulate(beacon);
    probe = wps_ie_encapsulate(probe);

    if (!beacon || !probe) {
        wpabuf_free(beacon);
        wpabuf_free(probe);
        return -1;
    }

    if (reg->static_wep_only) {
        /*
         * Windows XP and Vista clients can get confused about
         * EAP-Identity/Request when they probe the network with
         * EAPOL-Start. In such a case, they may assume the network is
         * using IEEE 802.1X and prompt user for a certificate while
         * the correct (non-WPS) behavior would be to ask for the
         * static WEP key. As a workaround, use Microsoft Provisioning
         * IE to advertise that legacy 802.1X is not supported.
         */
        const u8 ms_wps[7] = {
            WLAN_EID_VENDOR_SPECIFIC, 5,
            /* Microsoft Provisioning IE (00:50:f2:5) */
            0x00, 0x50, 0xf2, 5,
            0x00 /* no legacy 802.1X or MS WPS */
        };
        wpa_printf(MSG_DEBUG, "WPS: Add Microsoft Provisioning IE "
                "into Beacon/Probe Response frames");
        wpabuf_put_data(beacon, ms_wps, sizeof(ms_wps));
        wpabuf_put_data(probe, ms_wps, sizeof(ms_wps));
    }

    return wps_cb_set_ie(reg, beacon, probe);
}


static int wps_get_dev_password(struct wps_data *wps)
{
    const u8 *pin;
    size_t pin_len = 0;

    os_free(wps->dev_password);
    wps->dev_password = NULL;

    pin = wps_registrar_get_pin(wps->wps->registrar, wps->uuid_e, &pin_len);
    if (pin == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No Device Password available for "
                "the Enrollee");
        if(wps->wps->registrar != NULL)
        {
            wps_cb_pin_needed(wps->wps->registrar, wps->uuid_e,
                    &wps->peer_dev);
        }
        return -1;
    }

    wps->dev_password = os_malloc(pin_len);
    if (wps->dev_password == NULL)
        return -1;
    os_memcpy(wps->dev_password, pin, pin_len);
    wps->dev_password_len = pin_len;

    return 0;
}


static int wps_build_uuid_r(struct wps_data *wps, struct wpabuf *msg)
{
    wpa_printf(MSG_DEBUG, "WPS:  * UUID-R");
    wpabuf_put_be16(msg, ATTR_UUID_R);
    wpabuf_put_be16(msg, WPS_UUID_LEN);
    wpabuf_put_data(msg, wps->uuid_r, WPS_UUID_LEN);
    return 0;
}


static int wps_build_r_hash(struct wps_data *wps, struct wpabuf *msg)
{
    u8 *hash;
    const u8 *addr[4];
    size_t len[4];

    if (os_get_random(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0)
        return -1;
    wpa_hexdump(MSG_DEBUG, "WPS: R-S1", wps->snonce, WPS_SECRET_NONCE_LEN);
    wpa_hexdump(MSG_DEBUG, "WPS: R-S2",
            wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN);

    if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for "
                "R-Hash derivation");
        return -1;
    }

    wpa_printf(MSG_DEBUG, "WPS:  * R-Hash1");
    wpabuf_put_be16(msg, ATTR_R_HASH1);
    wpabuf_put_be16(msg, SHA256_MAC_LEN);
    hash = wpabuf_put(msg, SHA256_MAC_LEN);
    /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */
    addr[0] = wps->snonce;
    len[0] = WPS_SECRET_NONCE_LEN;
    addr[1] = wps->psk1;
    len[1] = WPS_PSK_LEN;
    addr[2] = wpabuf_head(wps->dh_pubkey_e);
    len[2] = wpabuf_len(wps->dh_pubkey_e);
    addr[3] = wpabuf_head(wps->dh_pubkey_r);
    len[3] = wpabuf_len(wps->dh_pubkey_r);
    hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
    wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", hash, SHA256_MAC_LEN);

    wpa_printf(MSG_DEBUG, "WPS:  * R-Hash2");
    wpabuf_put_be16(msg, ATTR_R_HASH2);
    wpabuf_put_be16(msg, SHA256_MAC_LEN);
    hash = wpabuf_put(msg, SHA256_MAC_LEN);
    /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */
    addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN;
    addr[1] = wps->psk2;
    hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
    wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", hash, SHA256_MAC_LEN);

    return 0;
}


static int wps_build_r_snonce1(struct wps_data *wps, struct wpabuf *msg)
{
    wpa_printf(MSG_DEBUG, "WPS:  * R-SNonce1");
    wpabuf_put_be16(msg, ATTR_R_SNONCE1);
    wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
    wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN);
    return 0;
}


static int wps_build_r_snonce2(struct wps_data *wps, struct wpabuf *msg)
{
    wpa_printf(MSG_DEBUG, "WPS:  * R-SNonce2");
    wpabuf_put_be16(msg, ATTR_R_SNONCE2);
    wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
    wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN,
            WPS_SECRET_NONCE_LEN);
    return 0;
}


static int wps_build_cred_network_idx(struct wpabuf *msg,
        const struct wps_credential *cred)
{
    wpa_printf(MSG_DEBUG, "WPS:  * Network Index");
    wpabuf_put_be16(msg, ATTR_NETWORK_INDEX);
    wpabuf_put_be16(msg, 1);
    wpabuf_put_u8(msg, 1);
    return 0;
}


static int wps_build_cred_ssid(struct wpabuf *msg,
        const struct wps_credential *cred)
{
    wpa_printf(MSG_DEBUG, "WPS:  * SSID");
    wpabuf_put_be16(msg, ATTR_SSID);
    wpabuf_put_be16(msg, cred->ssid_len);
    wpabuf_put_data(msg, cred->ssid, cred->ssid_len);
    return 0;
}


static int wps_build_cred_auth_type(struct wpabuf *msg,
        const struct wps_credential *cred)
{
    wpa_printf(MSG_DEBUG, "WPS:  * Authentication Type (0x%x)",
            cred->auth_type);
    wpabuf_put_be16(msg, ATTR_AUTH_TYPE);
    wpabuf_put_be16(msg, 2);
    wpabuf_put_be16(msg, cred->auth_type);
    return 0;
}


static int wps_build_cred_encr_type(struct wpabuf *msg,
        const struct wps_credential *cred)
{
    wpa_printf(MSG_DEBUG, "WPS:  * Encryption Type (0x%x)",
            cred->encr_type);
    wpabuf_put_be16(msg, ATTR_ENCR_TYPE);
    wpabuf_put_be16(msg, 2);
    wpabuf_put_be16(msg, cred->encr_type);
    return 0;
}


static int wps_build_cred_network_key(struct wpabuf *msg,
        const struct wps_credential *cred)
{
    wpa_printf(MSG_DEBUG, "WPS:  * Network Key (len=%d)",
            (int) cred->key_len);
    wpabuf_put_be16(msg, ATTR_NETWORK_KEY);
    wpabuf_put_be16(msg, cred->key_len);
    wpabuf_put_data(msg, cred->key, cred->key_len);
    return 0;
}


static int wps_build_cred_mac_addr(struct wpabuf *msg,
        const struct wps_credential *cred)
{
    wpa_printf(MSG_DEBUG, "WPS:  * MAC Address (" MACSTR ")",
            MAC2STR(cred->mac_addr));
    wpabuf_put_be16(msg, ATTR_MAC_ADDR);
    wpabuf_put_be16(msg, ETH_ALEN);
    wpabuf_put_data(msg, cred->mac_addr, ETH_ALEN);
    return 0;
}


static int wps_build_credential(struct wpabuf *msg,
        const struct wps_credential *cred)
{
    if (wps_build_cred_network_idx(msg, cred) ||
            wps_build_cred_ssid(msg, cred) ||
            wps_build_cred_auth_type(msg, cred) ||
            wps_build_cred_encr_type(msg, cred) ||
            wps_build_cred_network_key(msg, cred) ||
            wps_build_cred_mac_addr(msg, cred))
        return -1;
    return 0;
}


int wps_build_cred(struct wps_data *wps, struct wpabuf *msg)
{
    struct wpabuf *cred;

    if (wps->wps->registrar->skip_cred_build)
        goto skip_cred_build;

    wpa_printf(MSG_DEBUG, "WPS:  * Credential");
    if (wps->use_cred) {
        os_memcpy(&wps->cred, wps->use_cred, sizeof(wps->cred));
        goto use_provided;
    }
    os_memset(&wps->cred, 0, sizeof(wps->cred));

    os_memcpy(wps->cred.ssid, wps->wps->ssid, wps->wps->ssid_len);
    wps->cred.ssid_len = wps->wps->ssid_len;

    /* Select the best authentication and encryption type */
    if (wps->auth_type & WPS_AUTH_WPA2PSK)
        wps->auth_type = WPS_AUTH_WPA2PSK;
    else if (wps->auth_type & WPS_AUTH_WPAPSK)
        wps->auth_type = WPS_AUTH_WPAPSK;
    else if (wps->auth_type & WPS_AUTH_OPEN)
        wps->auth_type = WPS_AUTH_OPEN;
    else if (wps->auth_type & WPS_AUTH_SHARED)
        wps->auth_type = WPS_AUTH_SHARED;
    else {
        wpa_printf(MSG_DEBUG, "WPS: Unsupported auth_type 0x%x",
                wps->auth_type);
        return -1;
    }
    wps->cred.auth_type = wps->auth_type;

    if (wps->auth_type == WPS_AUTH_WPA2PSK ||
            wps->auth_type == WPS_AUTH_WPAPSK) {
        if (wps->encr_type & WPS_ENCR_AES)
            wps->encr_type = WPS_ENCR_AES;
        else if (wps->encr_type & WPS_ENCR_TKIP)
            wps->encr_type = WPS_ENCR_TKIP;
        else {
            wpa_printf(MSG_DEBUG, "WPS: No suitable encryption "
                    "type for WPA/WPA2");
            return -1;
        }
    } else {
        if (wps->encr_type & WPS_ENCR_WEP)
            wps->encr_type = WPS_ENCR_WEP;
        else if (wps->encr_type & WPS_ENCR_NONE)
            wps->encr_type = WPS_ENCR_NONE;
        else {
            wpa_printf(MSG_DEBUG, "WPS: No suitable encryption "
                    "type for non-WPA/WPA2 mode");
            return -1;
        }
    }
    wps->cred.encr_type = wps->encr_type;
    /*
     * Set MAC address in the Credential to be the Enrollee's MAC address
     */
    os_memcpy(wps->cred.mac_addr, wps->mac_addr_e, ETH_ALEN);

    if (wps->wps->wps_state == WPS_STATE_NOT_CONFIGURED && wps->wps->ap &&
            !wps->wps->registrar->disable_auto_conf) {
        u8 r[16];
        /* Generate a random passphrase */
        if (os_get_random(r, sizeof(r)) < 0)
            return -1;
        os_free(wps->new_psk);
        wps->new_psk = base64_encode(r, sizeof(r), &wps->new_psk_len);
        if (wps->new_psk == NULL)
            return -1;
        wps->new_psk_len--; /* remove newline */
        while (wps->new_psk_len &&
                wps->new_psk[wps->new_psk_len - 1] == '=')
            wps->new_psk_len--;
        wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: Generated passphrase",
                wps->new_psk, wps->new_psk_len);
        os_memcpy(wps->cred.key, wps->new_psk, wps->new_psk_len);
        wps->cred.key_len = wps->new_psk_len;
    } else if (wps->use_psk_key && wps->wps->psk_set) {
        char hex[65];
        wpa_printf(MSG_DEBUG, "WPS: Use PSK format for Network Key");
        wpa_snprintf_hex(hex, sizeof(hex), wps->wps->psk, 32);
        os_memcpy(wps->cred.key, hex, 32 * 2);
        wps->cred.key_len = 32 * 2;
    } else if (wps->wps->network_key) {
        os_memcpy(wps->cred.key, wps->wps->network_key,
                wps->wps->network_key_len);
        wps->cred.key_len = wps->wps->network_key_len;
    } else if (wps->auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) {
        char hex[65];
        /* Generate a random per-device PSK */
        os_free(wps->new_psk);
        wps->new_psk_len = 32;
        wps->new_psk = os_malloc(wps->new_psk_len);
        if (wps->new_psk == NULL)
            return -1;
        if (os_get_random(wps->new_psk, wps->new_psk_len) < 0) {
            os_free(wps->new_psk);
            wps->new_psk = NULL;
            return -1;
        }
        wpa_hexdump_key(MSG_DEBUG, "WPS: Generated per-device PSK",
                wps->new_psk, wps->new_psk_len);
        wpa_snprintf_hex(hex, sizeof(hex), wps->new_psk,
                wps->new_psk_len);
        os_memcpy(wps->cred.key, hex, wps->new_psk_len * 2);
        wps->cred.key_len = wps->new_psk_len * 2;
    }

use_provided:
    cred = wpabuf_alloc(200);
    if (cred == NULL)
        return -1;

    if (wps_build_credential(cred, &wps->cred)) {
        wpabuf_free(cred);
        return -1;
    }

    wpabuf_put_be16(msg, ATTR_CRED);
    wpabuf_put_be16(msg, wpabuf_len(cred));
    wpabuf_put_buf(msg, cred);
    wpabuf_free(cred);

skip_cred_build:
    if (wps->wps->registrar->extra_cred) {
        wpa_printf(MSG_DEBUG, "WPS:  * Credential (pre-configured)");
        wpabuf_put_buf(msg, wps->wps->registrar->extra_cred);
    }

    return 0;
}


static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *msg)
{
    wpa_printf(MSG_DEBUG, "WPS:  * AP Settings");

    if (wps_build_credential(msg, &wps->cred))
        return -1;

    return 0;
}


static struct wpabuf * wps_build_m2(struct wps_data *wps)
{
    struct wpabuf *msg;

    if (os_get_random(wps->nonce_r, WPS_NONCE_LEN) < 0)
        return NULL;
    wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce",
            wps->nonce_r, WPS_NONCE_LEN);
    wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN);

    wpa_printf(MSG_DEBUG, "WPS: Building Message M2");
    msg = wpabuf_alloc(1000);
    if (msg == NULL)
        return NULL;

    if (wps_build_version(msg) ||
            wps_build_msg_type(msg, WPS_M2) ||
            wps_build_enrollee_nonce(wps, msg) ||
            wps_build_registrar_nonce(wps, msg) ||
            wps_build_uuid_r(wps, msg) ||
            wps_build_public_key(wps, msg) ||
            wps_derive_keys(wps) ||
            wps_build_auth_type_flags(wps, msg) ||
            wps_build_encr_type_flags(wps, msg) ||
            wps_build_conn_type_flags(wps, msg) ||
            wps_build_config_methods_r(wps->wps->registrar, msg) ||
            wps_build_device_attrs(&wps->wps->dev, msg) ||
            wps_build_rf_bands(&wps->wps->dev, msg) ||
            wps_build_assoc_state(wps, msg) ||
            wps_build_config_error(msg, WPS_CFG_NO_ERROR) ||
            wps_build_dev_password_id(msg, wps->dev_pw_id) ||
            wps_build_os_version(&wps->wps->dev, msg) ||
            wps_build_authenticator(wps, msg)) {
        wpabuf_free(msg);
        return NULL;
    }

    wps->int_reg = 1;
    wps->state = RECV_M3;
    return msg;
}


static struct wpabuf * wps_build_m2d(struct wps_data *wps)
{
    struct wpabuf *msg;
    u16 err = wps->config_error;

    wpa_printf(MSG_DEBUG, "WPS: Building Message M2D");
    msg = wpabuf_alloc(1000);
    if (msg == NULL)
        return NULL;

    if (wps->wps->ap && wps->wps->ap_setup_locked &&
            err == WPS_CFG_NO_ERROR)
        err = WPS_CFG_SETUP_LOCKED;

    if (wps_build_version(msg) ||
            wps_build_msg_type(msg, WPS_M2D) ||
            wps_build_enrollee_nonce(wps, msg) ||
            wps_build_registrar_nonce(wps, msg) ||
            wps_build_uuid_r(wps, msg) ||
            wps_build_auth_type_flags(wps, msg) ||
            wps_build_encr_type_flags(wps, msg) ||
            wps_build_conn_type_flags(wps, msg) ||
            wps_build_config_methods_r(wps->wps->registrar, msg) ||
            wps_build_device_attrs(&wps->wps->dev, msg) ||
            wps_build_rf_bands(&wps->wps->dev, msg) ||
            wps_build_assoc_state(wps, msg) ||
            wps_build_config_error(msg, err) ||
            wps_build_os_version(&wps->wps->dev, msg)) {
        wpabuf_free(msg);
        return NULL;
    }

    wps->state = RECV_M2D_ACK;
    return msg;
}


static struct wpabuf * wps_build_m4(struct wps_data *wps)
{
    struct wpabuf *msg, *plain;

    wpa_printf(MSG_DEBUG, "WPS: Building Message M4");

    wpa_printf(MSG_DEBUG, "WPS: Dev Password Len: %d", wps->dev_password_len);
    wpa_printf(MSG_DEBUG, "WPS: Dev Password: %s", wps->dev_password);

    wps_derive_psk(wps, wps->dev_password, wps->dev_password_len);

    plain = wpabuf_alloc(200);
    if (plain == NULL)
        return NULL;

    msg = wpabuf_alloc(1000);
    if (msg == NULL) {
        wpabuf_free(plain);
        return NULL;
    }

    wpa_printf(MSG_DEBUG, "Allocs OK, building M4 packet");

    if (wps_build_version(msg) ||
            wps_build_msg_type(msg, WPS_M4) ||
            wps_build_enrollee_nonce(wps, msg) ||
            wps_build_r_hash(wps, msg) ||
            wps_build_r_snonce1(wps, plain) ||
            wps_build_key_wrap_auth(wps, plain) ||
            wps_build_encr_settings(wps, msg, plain) ||
            wps_build_authenticator(wps, msg)) {
        wpabuf_free(plain);
        wpabuf_free(msg);
        return NULL;
    }
    wpabuf_free(plain);

    wps->state = RECV_M5;
    return msg;
}


static struct wpabuf * wps_build_m6(struct wps_data *wps)
{
    struct wpabuf *msg, *plain;

    wpa_printf(MSG_DEBUG, "WPS: Building Message M6");

    plain = wpabuf_alloc(200);
    if (plain == NULL)
        return NULL;

    msg = wpabuf_alloc(1000);
    if (msg == NULL) {
        wpabuf_free(plain);
        return NULL;
    }

    if (wps_build_version(msg) ||
            wps_build_msg_type(msg, WPS_M6) ||
            wps_build_enrollee_nonce(wps, msg) ||
            wps_build_r_snonce2(wps, plain) ||
            wps_build_key_wrap_auth(wps, plain) ||
            wps_build_encr_settings(wps, msg, plain) ||
            wps_build_authenticator(wps, msg)) {
        wpabuf_free(plain);
        wpabuf_free(msg);
        return NULL;
    }
    wpabuf_free(plain);

    wps->wps_pin_revealed = 1;
    wps->state = RECV_M7;
    return msg;
}


static struct wpabuf * wps_build_m8(struct wps_data *wps)
{
    struct wpabuf *msg, *plain;

    wpa_printf(MSG_DEBUG, "WPS: Building Message M8");

    plain = wpabuf_alloc(500);
    if (plain == NULL)
        return NULL;

    msg = wpabuf_alloc(1000);
    if (msg == NULL) {
        wpabuf_free(plain);
        return NULL;
    }

    if (wps_build_version(msg) ||
            wps_build_msg_type(msg, WPS_M8) ||
            wps_build_enrollee_nonce(wps, msg) ||
            ((wps->wps->ap || wps->er) && wps_build_cred(wps, plain)) ||
            (!wps->wps->ap && !wps->er && wps_build_ap_settings(wps, plain)) ||
            wps_build_key_wrap_auth(wps, plain) ||
            wps_build_encr_settings(wps, msg, plain) ||
            wps_build_authenticator(wps, msg)) {
        wpabuf_free(plain);
        wpabuf_free(msg);
        return NULL;
    }
    wpabuf_free(plain);

    wps->state = RECV_DONE;
    return msg;
}


static struct wpabuf * wps_build_wsc_ack(struct wps_data *wps)
{
    struct wpabuf *msg;

    wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK");

    msg = wpabuf_alloc(1000);
    if (msg == NULL)
        return NULL;

    if (wps_build_version(msg) ||
            wps_build_msg_type(msg, WPS_WSC_ACK) ||
            wps_build_enrollee_nonce(wps, msg) ||
            wps_build_registrar_nonce(wps, msg)) {
        wpabuf_free(msg);
        return NULL;
    }

    return msg;
}


static struct wpabuf * wps_build_wsc_nack(struct wps_data *wps)
{
    struct wpabuf *msg;

    wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_NACK");

    msg = wpabuf_alloc(1000);
    if (msg == NULL)
        return NULL;

    if (wps_build_version(msg) ||
            wps_build_msg_type(msg, WPS_WSC_NACK) ||
            wps_build_enrollee_nonce(wps, msg) ||
            wps_build_registrar_nonce(wps, msg) ||
            wps_build_config_error(msg, wps->config_error)) {
        wpabuf_free(msg);
        return NULL;
    }

    return msg;
}


struct wpabuf * wps_registrar_get_msg(struct wps_data *wps,
        enum wsc_op_code *op_code,
        int type)
{
    struct wpabuf *msg = NULL;

    if(wps->wps->registrar != NULL)
    {
        switch (type) 
        {
            case SEND_M2:
                if(wps_get_dev_password(wps) >= 0)
                {
                    msg = wps_build_m2(wps);
                    cprintf(VERBOSE, "[+] Sending M2 message\n");
                    *op_code = WSC_MSG;
                    break;
                }
                /* Fall through */
            case SEND_WSC_NACK:
                msg = wps_build_wsc_nack(wps);
                cprintf(VERBOSE, "[+] Sending WSC NACK\n");
                *op_code = WSC_NACK;
                break;
            case SEND_M4:
                msg = wps_build_m4(wps);
                cprintf(VERBOSE, "[+] Sending M4 message\n");
                *op_code = WSC_MSG;
                break;
            case SEND_M6:
                msg = wps_build_m6(wps);
                cprintf(VERBOSE, "[+] Sending M6 message\n");
                *op_code = WSC_MSG;
                break;
            case SEND_M8:
                msg = wps_build_m8(wps);
                cprintf(VERBOSE, "[+] Sending M8 message\n");
                *op_code = WSC_MSG;
                break;
            case RECV_DONE:
                msg = wps_build_wsc_ack(wps);
                cprintf(VERBOSE, "[+] Sending WSC ACK\n");
                *op_code = WSC_ACK;
                break;
            default:
                wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building "
                        "a message", wps->state);
                msg = NULL;
                break;
        }
    }

    if (*op_code == WSC_MSG && msg) 
    {
        /* Save a copy of the last message for Authenticator derivation
        */
        wpabuf_free(wps->last_msg);
        wps->last_msg = wpabuf_dup(msg);
    }

    return msg;
}


static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce)
{
    if (e_nonce == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received");
        return -1;
    }

    os_memcpy(wps->nonce_e, e_nonce, WPS_NONCE_LEN);
    wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce",
            wps->nonce_e, WPS_NONCE_LEN);

    return 0;
}


static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce)
{
    if (r_nonce == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received");
        return -1;
    }

    if (os_memcmp(wps->nonce_r, r_nonce, WPS_NONCE_LEN) != 0) {
        wpa_printf(MSG_DEBUG, "WPS: Invalid Registrar Nonce received");
        return -1;
    }

    return 0;
}


static int wps_process_uuid_e(struct wps_data *wps, const u8 *uuid_e)
{
    if (uuid_e == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No UUID-E received");
        return -1;
    }

    os_memcpy(wps->uuid_e, uuid_e, WPS_UUID_LEN);
    wpa_hexdump(MSG_DEBUG, "WPS: UUID-E", wps->uuid_e, WPS_UUID_LEN);

    return 0;
}


static int wps_process_dev_password_id(struct wps_data *wps, const u8 *pw_id)
{
    if (pw_id == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No Device Password ID received");
        return -1;
    }

    wps->dev_pw_id = WPA_GET_BE16(pw_id);
    wpa_printf(MSG_DEBUG, "WPS: Device Password ID %d", wps->dev_pw_id);

    return 0;
}


static int wps_process_e_hash1(struct wps_data *wps, const u8 *e_hash1)
{
    if (e_hash1 == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No E-Hash1 received");
        return -1;
    }

    os_memcpy(wps->peer_hash1, e_hash1, WPS_HASH_LEN);
    wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", wps->peer_hash1, WPS_HASH_LEN);

    return 0;
}


static int wps_process_e_hash2(struct wps_data *wps, const u8 *e_hash2)
{
    if (e_hash2 == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No E-Hash2 received");
        return -1;
    }

    os_memcpy(wps->peer_hash2, e_hash2, WPS_HASH_LEN);
    wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", wps->peer_hash2, WPS_HASH_LEN);

    return 0;
}


static int wps_process_e_snonce1(struct wps_data *wps, const u8 *e_snonce1)
{
    u8 hash[SHA256_MAC_LEN];
    const u8 *addr[4];
    size_t len[4];

    if (e_snonce1 == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No E-SNonce1 received");
        return -1;
    }

    wpa_hexdump_key(MSG_DEBUG, "WPS: E-SNonce1", e_snonce1,
            WPS_SECRET_NONCE_LEN);

    /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */
    addr[0] = e_snonce1;
    len[0] = WPS_SECRET_NONCE_LEN;
    addr[1] = wps->psk1;
    len[1] = WPS_PSK_LEN;
    addr[2] = wpabuf_head(wps->dh_pubkey_e);
    len[2] = wpabuf_len(wps->dh_pubkey_e);
    addr[3] = wpabuf_head(wps->dh_pubkey_r);
    len[3] = wpabuf_len(wps->dh_pubkey_r);
    hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);

    if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) {
        wpa_printf(MSG_DEBUG, "WPS: E-Hash1 derived from E-S1 does "
                "not match with the pre-committed value");
        wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
        wps_pwd_auth_fail_event(wps->wps, 0, 1);
        return -1;
    }

    wpa_printf(MSG_DEBUG, "WPS: Enrollee proved knowledge of the first "
            "half of the device password");

    return 0;
}


static int wps_process_e_snonce2(struct wps_data *wps, const u8 *e_snonce2)
{
    u8 hash[SHA256_MAC_LEN];
    const u8 *addr[4];
    size_t len[4];

    if (e_snonce2 == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No E-SNonce2 received");
        return -1;
    }

    wpa_hexdump_key(MSG_DEBUG, "WPS: E-SNonce2", e_snonce2,
            WPS_SECRET_NONCE_LEN);

    /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */
    addr[0] = e_snonce2;
    len[0] = WPS_SECRET_NONCE_LEN;
    addr[1] = wps->psk2;
    len[1] = WPS_PSK_LEN;
    addr[2] = wpabuf_head(wps->dh_pubkey_e);
    len[2] = wpabuf_len(wps->dh_pubkey_e);
    addr[3] = wpabuf_head(wps->dh_pubkey_r);
    len[3] = wpabuf_len(wps->dh_pubkey_r);
    hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);

    if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) {
        wpa_printf(MSG_DEBUG, "WPS: E-Hash2 derived from E-S2 does "
                "not match with the pre-committed value");
        wps_registrar_invalidate_pin(wps->wps->registrar, wps->uuid_e);
        wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
        wps_pwd_auth_fail_event(wps->wps, 0, 2);
        return -1;
    }

    wpa_printf(MSG_DEBUG, "WPS: Enrollee proved knowledge of the second "
            "half of the device password");
    wps->wps_pin_revealed = 0;
    wps_registrar_unlock_pin(wps->wps->registrar, wps->uuid_e);

    return 0;
}


static int wps_process_mac_addr(struct wps_data *wps, const u8 *mac_addr)
{
    if (mac_addr == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No MAC Address received");
        return -1;
    }

    wpa_printf(MSG_DEBUG, "WPS: Enrollee MAC Address " MACSTR,
            MAC2STR(mac_addr));
    os_memcpy(wps->mac_addr_e, mac_addr, ETH_ALEN);
    os_memcpy(wps->peer_dev.mac_addr, mac_addr, ETH_ALEN);

    return 0;
}


static int wps_process_pubkey(struct wps_data *wps, const u8 *pk,
        size_t pk_len)
{
    if (pk == NULL || pk_len == 0) {
        wpa_printf(MSG_DEBUG, "WPS: No Public Key received");
        return -1;
    }

#ifdef CONFIG_WPS_OOB
    if (wps->wps->oob_conf.pubkey_hash != NULL) {
        const u8 *addr[1];
        u8 hash[WPS_HASH_LEN];

        addr[0] = pk;
        sha256_vector(1, addr, &pk_len, hash);
        if (os_memcmp(hash,
                    wpabuf_head(wps->wps->oob_conf.pubkey_hash),
                    WPS_OOB_PUBKEY_HASH_LEN) != 0) {
            wpa_printf(MSG_ERROR, "WPS: Public Key hash error");
            return -1;
        }
    }
#endif /* CONFIG_WPS_OOB */

    wpabuf_free(wps->dh_pubkey_e);
    wps->dh_pubkey_e = wpabuf_alloc_copy(pk, pk_len);
    if (wps->dh_pubkey_e == NULL)
        return -1;

    return 0;
}


static int wps_process_auth_type_flags(struct wps_data *wps, const u8 *auth)
{
    u16 auth_types;

    if (auth == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No Authentication Type flags "
                "received");
        return -1;
    }

    auth_types = WPA_GET_BE16(auth);

    wpa_printf(MSG_DEBUG, "WPS: Enrollee Authentication Type flags 0x%x",
            auth_types);
    wps->auth_type = wps->wps->auth_types & auth_types;
    if (wps->auth_type == 0) {
        wpa_printf(MSG_DEBUG, "WPS: No match in supported "
                "authentication types (own 0x%x Enrollee 0x%x)",
                wps->wps->auth_types, auth_types);
#ifdef WPS_WORKAROUNDS
        /*
         * Some deployed implementations seem to advertise incorrect
         * information in this attribute. For example, Linksys WRT350N
         * seems to have a byteorder bug that breaks this negotiation.
         * In order to interoperate with existing implementations,
         * assume that the Enrollee supports everything we do.
         */
        wpa_printf(MSG_DEBUG, "WPS: Workaround - assume Enrollee "
                "does not advertise supported authentication types "
                "correctly");
        wps->auth_type = wps->wps->auth_types;
#else /* WPS_WORKAROUNDS */
        return -1;
#endif /* WPS_WORKAROUNDS */
    }

    return 0;
}


static int wps_process_encr_type_flags(struct wps_data *wps, const u8 *encr)
{
    u16 encr_types;

    if (encr == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No Encryption Type flags "
                "received");
        return -1;
    }

    encr_types = WPA_GET_BE16(encr);

    wpa_printf(MSG_DEBUG, "WPS: Enrollee Encryption Type flags 0x%x",
            encr_types);
    wps->encr_type = wps->wps->encr_types & encr_types;
    if (wps->encr_type == 0) {
        wpa_printf(MSG_DEBUG, "WPS: No match in supported "
                "encryption types (own 0x%x Enrollee 0x%x)",
                wps->wps->encr_types, encr_types);
#ifdef WPS_WORKAROUNDS
        /*
         * Some deployed implementations seem to advertise incorrect
         * information in this attribute. For example, Linksys WRT350N
         * seems to have a byteorder bug that breaks this negotiation.
         * In order to interoperate with existing implementations,
         * assume that the Enrollee supports everything we do.
         */
        wpa_printf(MSG_DEBUG, "WPS: Workaround - assume Enrollee "
                "does not advertise supported encryption types "
                "correctly");
        wps->encr_type = wps->wps->encr_types;
#else /* WPS_WORKAROUNDS */
        return -1;
#endif /* WPS_WORKAROUNDS */
    }

    return 0;
}


static int wps_process_conn_type_flags(struct wps_data *wps, const u8 *conn)
{
    if (conn == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No Connection Type flags "
                "received");
        return -1;
    }

    wpa_printf(MSG_DEBUG, "WPS: Enrollee Connection Type flags 0x%x",
            *conn);

    return 0;
}


static int wps_process_config_methods(struct wps_data *wps, const u8 *methods)
{
    u16 m;

    if (methods == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No Config Methods received");
        return -1;
    }

    m = WPA_GET_BE16(methods);

    wpa_printf(MSG_DEBUG, "WPS: Enrollee Config Methods 0x%x"
            "%s%s%s%s%s%s%s%s%s", m,
            m & WPS_CONFIG_USBA ? " [USBA]" : "",
            m & WPS_CONFIG_ETHERNET ? " [Ethernet]" : "",
            m & WPS_CONFIG_LABEL ? " [Label]" : "",
            m & WPS_CONFIG_DISPLAY ? " [Display]" : "",
            m & WPS_CONFIG_EXT_NFC_TOKEN ? " [Ext NFC Token]" : "",
            m & WPS_CONFIG_INT_NFC_TOKEN ? " [Int NFC Token]" : "",
            m & WPS_CONFIG_NFC_INTERFACE ? " [NFC]" : "",
            m & WPS_CONFIG_PUSHBUTTON ? " [PBC]" : "",
            m & WPS_CONFIG_KEYPAD ? " [Keypad]" : "");

    if (!(m & WPS_CONFIG_DISPLAY) && !wps->use_psk_key) {
        /*
         * The Enrollee does not have a display so it is unlikely to be
         * able to show the passphrase to a user and as such, could
         * benefit from receiving PSK to reduce key derivation time.
         */
        wpa_printf(MSG_DEBUG, "WPS: Prefer PSK format key due to "
                "Enrollee not supporting display");
        wps->use_psk_key = 1;
    }

    return 0;
}


static int wps_process_wps_state(struct wps_data *wps, const u8 *state)
{
    if (state == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No Wi-Fi Protected Setup State "
                "received");
        return -1;
    }

    wpa_printf(MSG_DEBUG, "WPS: Enrollee Wi-Fi Protected Setup State %d",
            *state);

    return 0;
}


static int wps_process_assoc_state(struct wps_data *wps, const u8 *assoc)
{
    u16 a;

    if (assoc == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No Association State received");
        return -1;
    }

    a = WPA_GET_BE16(assoc);
    wpa_printf(MSG_DEBUG, "WPS: Enrollee Association State %d", a);

    return 0;
}


static int wps_process_config_error(struct wps_data *wps, const u8 *err)
{
    u16 e;

    if (err == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No Configuration Error received");
        return -1;
    }

    e = WPA_GET_BE16(err);
    wpa_printf(MSG_DEBUG, "WPS: Enrollee Configuration Error %d", e);

    return 0;
}


static enum wps_process_res wps_process_m1(struct wps_data *wps,
        struct wps_parse_attr *attr)
{
    wpa_printf(MSG_DEBUG, "WPS: Received M1");

    if (wps->state != RECV_M1) {
        wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
                "receiving M1", wps->state);
        return WPS_FAILURE;
    }

    if (wps_process_uuid_e(wps, attr->uuid_e) ||
            wps_process_mac_addr(wps, attr->mac_addr) ||
            wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
            wps_process_pubkey(wps, attr->public_key, attr->public_key_len) ||
            wps_process_auth_type_flags(wps, attr->auth_type_flags) ||
            wps_process_encr_type_flags(wps, attr->encr_type_flags) ||
            wps_process_conn_type_flags(wps, attr->conn_type_flags) ||
            wps_process_config_methods(wps, attr->config_methods) ||
            wps_process_wps_state(wps, attr->wps_state) ||
            wps_process_device_attrs(&wps->peer_dev, attr) ||
            wps_process_rf_bands(&wps->peer_dev, attr->rf_bands) ||
            wps_process_assoc_state(wps, attr->assoc_state) ||
            wps_process_dev_password_id(wps, attr->dev_password_id) ||
            wps_process_config_error(wps, attr->config_error) ||
            wps_process_os_version(&wps->peer_dev, attr->os_version))
        return WPS_FAILURE;

    wpa_printf(MSG_DEBUG, "WPS: M1 Processed");

    if (wps->dev_pw_id < 0x10 &&
            wps->dev_pw_id != DEV_PW_DEFAULT &&
            wps->dev_pw_id != DEV_PW_USER_SPECIFIED &&
            wps->dev_pw_id != DEV_PW_MACHINE_SPECIFIED &&
            wps->dev_pw_id != DEV_PW_REGISTRAR_SPECIFIED &&
            (wps->dev_pw_id != DEV_PW_PUSHBUTTON ||
             !wps->wps->registrar->pbc)) {
        wpa_printf(MSG_DEBUG, "WPS: Unsupported Device Password ID %d",
                wps->dev_pw_id);
        wps->state = SEND_M2D;
        return WPS_CONTINUE;
    }

    wpa_printf(MSG_DEBUG, "WPS: dev_pw_id checked");

#ifdef CONFIG_WPS_OOB
    if (wps->dev_pw_id >= 0x10 &&
            wps->dev_pw_id != wps->wps->oob_dev_pw_id) {
        wpa_printf(MSG_DEBUG, "WPS: OOB Device Password ID "
                "%d mismatch", wps->dev_pw_id);
        wps->state = SEND_M2D;
        return WPS_CONTINUE;
    }
#endif /* CONFIG_WPS_OOB */

    if (wps->dev_pw_id == DEV_PW_PUSHBUTTON) {
        if (wps->wps->registrar->force_pbc_overlap ||
                wps_registrar_pbc_overlap(wps->wps->registrar,
                    wps->mac_addr_e, wps->uuid_e)) {
            wpa_printf(MSG_DEBUG, "WPS: PBC overlap - deny PBC "
                    "negotiation");
            wps->state = SEND_M2D;
            wps->config_error = WPS_CFG_MULTIPLE_PBC_DETECTED;
            wps_pbc_overlap_event(wps->wps);
            wps->wps->registrar->force_pbc_overlap = 1;
            return WPS_CONTINUE;
        }
        wps_registrar_add_pbc_session(wps->wps->registrar,
                wps->mac_addr_e, wps->uuid_e);
        wps->pbc = 1;
    }

    wpa_printf(MSG_DEBUG, "WPS: PBC Checked");

#ifdef WPS_WORKAROUNDS
    /*
     * It looks like Mac OS X 10.6.3 and 10.6.4 do not like Network Key in
     * passphrase format. To avoid interop issues, force PSK format to be
     * used.
     */
    if (!wps->use_psk_key &&
            wps->peer_dev.manufacturer &&
            os_strncmp(wps->peer_dev.manufacturer, "Apple ", 6) == 0 &&
            wps->peer_dev.model_name &&
            os_strcmp(wps->peer_dev.model_name, "AirPort") == 0) {
        wpa_printf(MSG_DEBUG, "WPS: Workaround - Force Network Key in "
                "PSK format");
        wps->use_psk_key = 1;
    }
#endif /* WPS_WORKAROUNDS */
    wpa_printf(MSG_DEBUG, "WPS: Entering State SEND_M2");

    wps->state = SEND_M2;
    return WPS_CONTINUE;
}


static enum wps_process_res wps_process_m3(struct wps_data *wps,
        const struct wpabuf *msg,
        struct wps_parse_attr *attr)
{
    wpa_printf(MSG_DEBUG, "WPS: Received M3");

    if (wps->state != RECV_M3) {
        wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
                "receiving M3", wps->state);
        wps->state = SEND_WSC_NACK;
        return WPS_CONTINUE;
    }

    if (wps->pbc && wps->wps->registrar->force_pbc_overlap) {
        wpa_printf(MSG_DEBUG, "WPS: Reject negotiation due to PBC "
                "session overlap");
        wps->state = SEND_WSC_NACK;
        wps->config_error = WPS_CFG_MULTIPLE_PBC_DETECTED;
        return WPS_CONTINUE;
    }

    if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
            wps_process_authenticator(wps, attr->authenticator, msg) ||
            wps_process_e_hash1(wps, attr->e_hash1) ||
            wps_process_e_hash2(wps, attr->e_hash2)) {
        wps->state = SEND_WSC_NACK;
        return WPS_CONTINUE;
    }

    wps->state = SEND_M4;
    return WPS_CONTINUE;
}


static enum wps_process_res wps_process_m5(struct wps_data *wps,
        const struct wpabuf *msg,
        struct wps_parse_attr *attr)
{
    struct wpabuf *decrypted;
    struct wps_parse_attr eattr;

    wpa_printf(MSG_DEBUG, "WPS: Received M5");

    if (wps->state != RECV_M5) {
        wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
                "receiving M5", wps->state);
        wps->state = SEND_WSC_NACK;
        return WPS_CONTINUE;
    }

    if (wps->pbc && wps->wps->registrar->force_pbc_overlap) {
        wpa_printf(MSG_DEBUG, "WPS: Reject negotiation due to PBC "
                "session overlap");
        wps->state = SEND_WSC_NACK;
        wps->config_error = WPS_CFG_MULTIPLE_PBC_DETECTED;
        return WPS_CONTINUE;
    }

    if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
            wps_process_authenticator(wps, attr->authenticator, msg)) {
        wps->state = SEND_WSC_NACK;
        return WPS_CONTINUE;
    }

    decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
            attr->encr_settings_len);
    if (decrypted == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
                "Settings attribute");
        wps->state = SEND_WSC_NACK;
        return WPS_CONTINUE;
    }

    wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
            "attribute");
    if (wps_parse_msg(decrypted, &eattr) < 0 ||
            wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
            wps_process_e_snonce1(wps, eattr.e_snonce1)) {
        wpabuf_free(decrypted);
        wps->state = SEND_WSC_NACK;
        return WPS_CONTINUE;
    }
    wpabuf_free(decrypted);

    wps->state = SEND_M6;
    return WPS_CONTINUE;
}


static void wps_sta_cred_cb(struct wps_data *wps)
{
    /*
     * Update credential to only include a single authentication and
     * encryption type in case the AP configuration includes more than one
     * option.
     */
    if (wps->cred.auth_type & WPS_AUTH_WPA2PSK)
        wps->cred.auth_type = WPS_AUTH_WPA2PSK;
    else if (wps->cred.auth_type & WPS_AUTH_WPAPSK)
        wps->cred.auth_type = WPS_AUTH_WPAPSK;
    if (wps->cred.encr_type & WPS_ENCR_AES)
        wps->cred.encr_type = WPS_ENCR_AES;
    else if (wps->cred.encr_type & WPS_ENCR_TKIP)
        wps->cred.encr_type = WPS_ENCR_TKIP;
    wpa_printf(MSG_DEBUG, "WPS: Update local configuration based on the "
            "AP configuration");
    if (wps->wps->cred_cb)
        wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred);
}


static void wps_cred_update(struct wps_credential *dst,
        struct wps_credential *src)
{
    os_memcpy(dst->ssid, src->ssid, sizeof(dst->ssid));
    dst->ssid_len = src->ssid_len;
    dst->auth_type = src->auth_type;
    dst->encr_type = src->encr_type;
    dst->key_idx = src->key_idx;
    os_memcpy(dst->key, src->key, sizeof(dst->key));
    dst->key_len = src->key_len;
}


static int wps_process_ap_settings_r(struct wps_data *wps,
        struct wps_parse_attr *attr)
{
    if (wps->wps->ap || wps->er)
        return 0;

    /* AP Settings Attributes in M7 when Enrollee is an AP */
    if (wps_process_ap_settings(attr, &wps->cred) < 0)
        return -1;

    /* @@@ Save a copy of the network key and ssid directly to the wps_data structure @@@ */
    if(wps->cred.key_len > 0)
    {
        wps->key = strdup(wps->cred.key);
    }
    if(wps->cred.ssid_len > 0)
    {
        wps->essid = strdup(wps->cred.ssid);
    }

    if (wps->new_ap_settings) {
        wpa_printf(MSG_INFO, "WPS: Update AP configuration based on "
                "new settings");
        wps_cred_update(&wps->cred, wps->new_ap_settings);
        return 0;
    } else {
        /*
         * Use the AP PIN only to receive the current AP settings, not
         * to reconfigure the AP.
         */
        if (wps->ap_settings_cb) {
            wps->ap_settings_cb(wps->ap_settings_cb_ctx,
                    &wps->cred);
            return 1;
        }
        wps_sta_cred_cb(wps);
        return 1;
    }
}


static enum wps_process_res wps_process_m7(struct wps_data *wps,
        const struct wpabuf *msg,
        struct wps_parse_attr *attr)
{
    struct wpabuf *decrypted;
    struct wps_parse_attr eattr;

    wpa_printf(MSG_DEBUG, "WPS: Received M7");

    if (wps->state != RECV_M7) {
        wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
                "receiving M7", wps->state);
        wps->state = SEND_WSC_NACK;
        return WPS_CONTINUE;
    }

    if (wps->pbc && wps->wps->registrar->force_pbc_overlap) {
        wpa_printf(MSG_DEBUG, "WPS: Reject negotiation due to PBC "
                "session overlap");
        wps->state = SEND_WSC_NACK;
        wps->config_error = WPS_CFG_MULTIPLE_PBC_DETECTED;
        return WPS_CONTINUE;
    }

    if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
            wps_process_authenticator(wps, attr->authenticator, msg)) {
        wps->state = SEND_WSC_NACK;
        return WPS_CONTINUE;
    }

    decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
            attr->encr_settings_len);
    if (decrypted == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: Failed to decrypt Encrypted "
                "Settings attribute");
        wps->state = SEND_WSC_NACK;
        return WPS_CONTINUE;
    }

    wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
            "attribute");

    /* @@@ One of these fails, but we don't really care. We just want the ap settings */
    /*
       if (wps_parse_msg(decrypted, &eattr) < 0 ||
       wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
       wps_process_e_snonce2(wps, eattr.e_snonce2) ||
       wps_process_ap_settings_r(wps, &eattr)) {
       wpabuf_free(decrypted);
       wps->state = SEND_WSC_NACK;
       return WPS_CONTINUE;
       }
       */

    if(wps_parse_msg(decrypted, &eattr) >= 0)
    {
        wps_process_ap_settings_r(wps, &eattr);
    }

    wpabuf_free(decrypted);

    wps->state = SEND_M8;
    return WPS_CONTINUE;
}


static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps,
        const struct wpabuf *msg)
{
    struct wps_parse_attr attr;
    enum wps_process_res ret = WPS_CONTINUE;

    wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG");

    if (wps_parse_msg(msg, &attr) < 0)
        return WPS_FAILURE;

    wpa_printf(MSG_DEBUG, "WPS: Parsed WSC_MSG");

    if (!wps_version_supported(attr.version)) {
        wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
                attr.version ? *attr.version : 0);
        return WPS_FAILURE;
    }

    if (attr.msg_type == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
        return WPS_FAILURE;
    }

    if (*attr.msg_type != WPS_M1 &&
            (attr.registrar_nonce == NULL ||
             os_memcmp(wps->nonce_r, attr.registrar_nonce,
                 WPS_NONCE_LEN != 0))) {
        wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
        return WPS_FAILURE;
    }

    switch (*attr.msg_type) {
        case WPS_M1:
#ifdef CONFIG_WPS_UPNP
            if (wps->wps->wps_upnp && attr.mac_addr) {
                /* Remove old pending messages when starting new run */
                wps_free_pending_msgs(wps->wps->upnp_msgs);
                wps->wps->upnp_msgs = NULL;

                upnp_wps_device_send_wlan_event(
                        wps->wps->wps_upnp, attr.mac_addr,
                        UPNP_WPS_WLANEVENT_TYPE_EAP, msg);
            }
#endif /* CONFIG_WPS_UPNP */
            ret = wps_process_m1(wps, &attr);
            break;
        case WPS_M3:
            ret = wps_process_m3(wps, msg, &attr);
            if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
                wps_fail_event(wps->wps, WPS_M3);
            break;
        case WPS_M5:
            ret = wps_process_m5(wps, msg, &attr);
            if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
                wps_fail_event(wps->wps, WPS_M5);
            break;
        case WPS_M7:
            ret = wps_process_m7(wps, msg, &attr);
            if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
                wps_fail_event(wps->wps, WPS_M7);
            break;
        default:
            wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d",
                    *attr.msg_type);
            return WPS_FAILURE;
    }

    if (ret == WPS_CONTINUE) {
        /* Save a copy of the last message for Authenticator derivation
        */

        wpa_printf(MSG_DEBUG, "WPS: WPS_CONTINUE, Freeing Last Message");	
        wpabuf_free(wps->last_msg);
        wpa_printf(MSG_DEBUG, "WPS: WPS_CONTINUE, Saving Last Message");	
        wps->last_msg = wpabuf_dup(msg);
    }

    wpa_printf(MSG_DEBUG, "WPS: returning");
    return ret;
}


static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps,
        const struct wpabuf *msg)
{
    struct wps_parse_attr attr;

    wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK");

    if (wps_parse_msg(msg, &attr) < 0)
        return WPS_FAILURE;

    if (!wps_version_supported(attr.version)) {
        wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
                attr.version ? *attr.version : 0);
        return WPS_FAILURE;
    }

    if (attr.msg_type == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
        return WPS_FAILURE;
    }

    if (*attr.msg_type != WPS_WSC_ACK) {
        wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
                *attr.msg_type);
        return WPS_FAILURE;
    }

#ifdef CONFIG_WPS_UPNP
    if (wps->wps->wps_upnp && wps->ext_reg && wps->state == RECV_M2D_ACK &&
            upnp_wps_subscribers(wps->wps->wps_upnp)) {
        if (wps->wps->upnp_msgs)
            return WPS_CONTINUE;
        wpa_printf(MSG_DEBUG, "WPS: Wait for response from an "
                "external Registrar");
        return WPS_PENDING;
    }
#endif /* CONFIG_WPS_UPNP */

    if (attr.registrar_nonce == NULL ||
            os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
    {
        wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
        return WPS_FAILURE;
    }

    if (attr.enrollee_nonce == NULL ||
            os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
        wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
        return WPS_FAILURE;
    }

    if (wps->state == RECV_M2D_ACK) {
#ifdef CONFIG_WPS_UPNP
        if (wps->wps->wps_upnp &&
                upnp_wps_subscribers(wps->wps->wps_upnp)) {
            if (wps->wps->upnp_msgs)
                return WPS_CONTINUE;
            if (wps->ext_reg == 0)
                wps->ext_reg = 1;
            wpa_printf(MSG_DEBUG, "WPS: Wait for response from an "
                    "external Registrar");
            return WPS_PENDING;
        }
#endif /* CONFIG_WPS_UPNP */

        wpa_printf(MSG_DEBUG, "WPS: No more registrars available - "
                "terminate negotiation");
    }

    return WPS_FAILURE;
}


static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps,
        const struct wpabuf *msg)
{
    struct wps_parse_attr attr;
    int old_state;

    wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK");

    old_state = wps->state;
    wps->state = SEND_WSC_NACK;

    if (wps_parse_msg(msg, &attr) < 0)
        return WPS_FAILURE;

    if (!wps_version_supported(attr.version)) {
        wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
                attr.version ? *attr.version : 0);
        return WPS_FAILURE;
    }

    if (attr.msg_type == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
        return WPS_FAILURE;
    }

    if (*attr.msg_type != WPS_WSC_NACK) {
        wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
                *attr.msg_type);
        return WPS_FAILURE;
    }

#ifdef CONFIG_WPS_UPNP
    if (wps->wps->wps_upnp && wps->ext_reg) {
        wpa_printf(MSG_DEBUG, "WPS: Negotiation using external "
                "Registrar terminated by the Enrollee");
        return WPS_FAILURE;
    }
#endif /* CONFIG_WPS_UPNP */

    if (attr.registrar_nonce == NULL ||
            os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
    {
        wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
        return WPS_FAILURE;
    }

    if (attr.enrollee_nonce == NULL ||
            os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
        wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
        return WPS_FAILURE;
    }

    if (attr.config_error == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute "
                "in WSC_NACK");
        return WPS_FAILURE;
    }

    wpa_printf(MSG_DEBUG, "WPS: Enrollee terminated negotiation with "
            "Configuration Error %d", WPA_GET_BE16(attr.config_error));

    switch (old_state) {
        case RECV_M3:
            wps_fail_event(wps->wps, WPS_M2);
            break;
        case RECV_M5:
            wps_fail_event(wps->wps, WPS_M4);
            break;
        case RECV_M7:
            wps_fail_event(wps->wps, WPS_M6);
            break;
        case RECV_DONE:
            wps_fail_event(wps->wps, WPS_M8);
            break;
        default:
            break;
    }

    return WPS_FAILURE;
}


static enum wps_process_res wps_process_wsc_done(struct wps_data *wps,
        const struct wpabuf *msg)
{
    struct wps_parse_attr attr;

    wpa_printf(MSG_DEBUG, "WPS: Received WSC_Done");

    if (wps->state != RECV_DONE &&
            (!wps->wps->wps_upnp || !wps->ext_reg)) {
        wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
                "receiving WSC_Done", wps->state);
        return WPS_FAILURE;
    }

    if (wps_parse_msg(msg, &attr) < 0)
        return WPS_FAILURE;

    if (!wps_version_supported(attr.version)) {
        wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
                attr.version ? *attr.version : 0);
        return WPS_FAILURE;
    }

    if (attr.msg_type == NULL) {
        wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
        return WPS_FAILURE;
    }

    if (*attr.msg_type != WPS_WSC_DONE) {
        wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
                *attr.msg_type);
        return WPS_FAILURE;
    }

#ifdef CONFIG_WPS_UPNP
    if (wps->wps->wps_upnp && wps->ext_reg) {
        wpa_printf(MSG_DEBUG, "WPS: Negotiation using external "
                "Registrar completed successfully");
        wps_device_store(wps->wps->registrar, &wps->peer_dev,
                wps->uuid_e);
        return WPS_DONE;
    }
#endif /* CONFIG_WPS_UPNP */

    if (attr.registrar_nonce == NULL ||
            os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
    {
        wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
        return WPS_FAILURE;
    }

    if (attr.enrollee_nonce == NULL ||
            os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
        wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
        return WPS_FAILURE;
    }

    wpa_printf(MSG_DEBUG, "WPS: Negotiation completed successfully");
    /* @@@ We don't need any of this, since we're just cracking keys
     *
     wps_device_store(wps->wps->registrar, &wps->peer_dev,
     wps->uuid_e);

     if (wps->wps->wps_state == WPS_STATE_NOT_CONFIGURED && wps->new_psk &&
     wps->wps->ap && !wps->wps->registrar->disable_auto_conf) {
     struct wps_credential cred;

     wpa_printf(MSG_DEBUG, "WPS: Moving to Configured state based "
     "on first Enrollee connection");

     os_memset(&cred, 0, sizeof(cred));
     os_memcpy(cred.ssid, wps->wps->ssid, wps->wps->ssid_len);
     cred.ssid_len = wps->wps->ssid_len;
     cred.auth_type = WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK;
     cred.encr_type = WPS_ENCR_TKIP | WPS_ENCR_AES;
     os_memcpy(cred.key, wps->new_psk, wps->new_psk_len);
     cred.key_len = wps->new_psk_len;

     wps->wps->wps_state = WPS_STATE_CONFIGURED;
     wpa_hexdump_ascii_key(MSG_DEBUG,
     "WPS: Generated random passphrase",
     wps->new_psk, wps->new_psk_len);
     if (wps->wps->cred_cb)
     wps->wps->cred_cb(wps->wps->cb_ctx, &cred);

     os_free(wps->new_psk);
     wps->new_psk = NULL;
     }

     if (!wps->wps->ap && !wps->er)
     wps_sta_cred_cb(wps);

     if (wps->new_psk) {
     if (wps_cb_new_psk(wps->wps->registrar, wps->mac_addr_e,
     wps->new_psk, wps->new_psk_len)) {
     wpa_printf(MSG_DEBUG, "WPS: Failed to configure the "
     "new PSK");
     }
     os_free(wps->new_psk);
     wps->new_psk = NULL;
     }

     wps_cb_reg_success(wps->wps->registrar, wps->mac_addr_e, wps->uuid_e);

     if (wps->pbc) {
     wps_registrar_remove_pbc_session(wps->wps->registrar,
     wps->mac_addr_e, wps->uuid_e);
     wps_registrar_pbc_completed(wps->wps->registrar);
     } else {
     wps_registrar_pin_completed(wps->wps->registrar);
     }
     *
     */

    wps_success_event(wps->wps);

    return WPS_DONE;
}


enum wps_process_res wps_registrar_process_msg(struct wps_data *wps,
        enum wsc_op_code op_code,
        const struct wpabuf *msg)
{
    enum wps_process_res ret;

    wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu "
            "op_code=%d)",
            (unsigned long) wpabuf_len(msg), op_code);

#ifdef CONFIG_WPS_UPNP
    if (wps->wps->wps_upnp && op_code == WSC_MSG && wps->ext_reg == 1) {
        struct wps_parse_attr attr;
        if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type &&
                *attr.msg_type == WPS_M3)
            wps->ext_reg = 2; /* past M2/M2D phase */
    }
    if (wps->ext_reg > 1)
        wps_registrar_free_pending_m2(wps->wps);
    if (wps->wps->wps_upnp && wps->ext_reg &&
            wps->wps->upnp_msgs == NULL &&
            (op_code == WSC_MSG || op_code == WSC_Done || op_code == WSC_NACK))
    {
        struct wps_parse_attr attr;
        int type;
        if (wps_parse_msg(msg, &attr) < 0 || attr.msg_type == NULL)
            type = -1;
        else
            type = *attr.msg_type;
        wpa_printf(MSG_DEBUG, "WPS: Sending received message (type %d)"
                " to external Registrar for processing", type);
        upnp_wps_device_send_wlan_event(wps->wps->wps_upnp,
                wps->mac_addr_e,
                UPNP_WPS_WLANEVENT_TYPE_EAP,
                msg);
        if (op_code == WSC_MSG)
            return WPS_PENDING;
    } else if (wps->wps->wps_upnp && wps->ext_reg && op_code == WSC_MSG) {
        wpa_printf(MSG_DEBUG, "WPS: Skip internal processing - using "
                "external Registrar");
        return WPS_CONTINUE;
    }
#endif /* CONFIG_WPS_UPNP */

    switch (op_code) {
        case WSC_MSG:
            return wps_process_wsc_msg(wps, msg);
        case WSC_ACK:
            return wps_process_wsc_ack(wps, msg);
        case WSC_NACK:
            return wps_process_wsc_nack(wps, msg);
        case WSC_Done:
            ret = wps_process_wsc_done(wps, msg);
            if (ret == WPS_FAILURE) {
                wps->state = SEND_WSC_NACK;
                wps_fail_event(wps->wps, WPS_WSC_DONE);
            }
            return ret;
        default:
            wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code);
            return WPS_FAILURE;
    }
}


int wps_registrar_update_ie(struct wps_registrar *reg)
{
    return wps_set_ie(reg);
}


static void wps_registrar_set_selected_timeout(void *eloop_ctx,
        void *timeout_ctx)
{
    struct wps_registrar *reg = eloop_ctx;

    wpa_printf(MSG_DEBUG, "WPS: Selected Registrar timeout - "
            "unselect internal Registrar");
    reg->selected_registrar = 0;
    reg->pbc = 0;
    wps_registrar_selected_registrar_changed(reg);
}


#ifdef CONFIG_WPS_UPNP
static void wps_registrar_sel_reg_add(struct wps_registrar *reg,
        struct subscription *s)
{
    wpa_printf(MSG_DEBUG, "WPS: External Registrar selected (dev_pw_id=%d "
            "config_methods=0x%x)",
            s->dev_password_id, s->config_methods);
    reg->sel_reg_union = 1;
    if (reg->sel_reg_dev_password_id_override != DEV_PW_PUSHBUTTON)
        reg->sel_reg_dev_password_id_override = s->dev_password_id;
    if (reg->sel_reg_config_methods_override == -1)
        reg->sel_reg_config_methods_override = 0;
    reg->sel_reg_config_methods_override |= s->config_methods;
}
#endif /* CONFIG_WPS_UPNP */


static void wps_registrar_sel_reg_union(struct wps_registrar *reg)
{
#ifdef CONFIG_WPS_UPNP
    struct subscription *s;

    if (reg->wps->wps_upnp == NULL)
        return;

    dl_list_for_each(s, &reg->wps->wps_upnp->subscriptions,
            struct subscription, list) {
        struct subscr_addr *sa;
        sa = dl_list_first(&s->addr_list, struct subscr_addr, list);
        if (sa) {
            wpa_printf(MSG_DEBUG, "WPS: External Registrar %s:%d",
                    inet_ntoa(sa->saddr.sin_addr),
                    ntohs(sa->saddr.sin_port));
        }
        if (s->selected_registrar)
            wps_registrar_sel_reg_add(reg, s);
        else
            wpa_printf(MSG_DEBUG, "WPS: External Registrar not "
                    "selected");
    }
#endif /* CONFIG_WPS_UPNP */
}


/**
 * wps_registrar_selected_registrar_changed - SetSelectedRegistrar change
 * @reg: Registrar data from wps_registrar_init()
 *
 * This function is called when selected registrar state changes, e.g., when an
 * AP receives a SetSelectedRegistrar UPnP message.
 */
void wps_registrar_selected_registrar_changed(struct wps_registrar *reg)
{
    wpa_printf(MSG_DEBUG, "WPS: Selected registrar information changed");

    reg->sel_reg_union = reg->selected_registrar;
    reg->sel_reg_dev_password_id_override = -1;
    reg->sel_reg_config_methods_override = -1;
    if (reg->selected_registrar) {
        reg->sel_reg_config_methods_override =
            reg->wps->config_methods & ~WPS_CONFIG_PUSHBUTTON;
        if (reg->pbc) {
            reg->sel_reg_dev_password_id_override =
                DEV_PW_PUSHBUTTON;
            reg->sel_reg_config_methods_override |=
                WPS_CONFIG_PUSHBUTTON;
        }
        wpa_printf(MSG_DEBUG, "WPS: Internal Registrar selected "
                "(pbc=%d)", reg->pbc);
    } else
        wpa_printf(MSG_DEBUG, "WPS: Internal Registrar not selected");

    wpa_printf(MSG_DEBUG, "WPS: sel_reg_union");

    wps_registrar_sel_reg_union(reg);

    wpa_printf(MSG_DEBUG, "WPS: set_ie");
    wps_set_ie(reg);
    wpa_printf(MSG_DEBUG, "WPS: cb_set_sel_reg");
    wps_cb_set_sel_reg(reg);
    wpa_printf(MSG_DEBUG, "WPS: return from wps_selected_registrar_changed");
}


int wps_registrar_get_info(struct wps_registrar *reg, const u8 *addr,
        char *buf, size_t buflen)
{
    struct wps_registrar_device *d;
    int len = 0, ret;
    char uuid[40];
    char devtype[WPS_DEV_TYPE_BUFSIZE];

    d = wps_device_get(reg, addr);
    if (d == NULL)
        return 0;
    if (uuid_bin2str(d->uuid, uuid, sizeof(uuid)))
        return 0;

    ret = os_snprintf(buf + len, buflen - len,
            "wpsUuid=%s\n"
            "wpsPrimaryDeviceType=%s\n"
            "wpsDeviceName=%s\n"
            "wpsManufacturer=%s\n"
            "wpsModelName=%s\n"
            "wpsModelNumber=%s\n"
            "wpsSerialNumber=%s\n",
            uuid,
            wps_dev_type_bin2str(d->dev.pri_dev_type, devtype,
                sizeof(devtype)),
            d->dev.device_name ? d->dev.device_name : "",
            d->dev.manufacturer ? d->dev.manufacturer : "",
            d->dev.model_name ? d->dev.model_name : "",
            d->dev.model_number ? d->dev.model_number : "",
            d->dev.serial_number ? d->dev.serial_number : "");
    if (ret < 0 || (size_t) ret >= buflen - len)
        return len;
    len += ret;

    return len;
}
